yánjiū / lìshǐ / yào / xuéhuì / tuīběnsùyuán / xúnzhǎo / shìjiàn / de / shēncéng / yuányīn

研究历史要学会推本溯源，寻找事件的深层原因。

When studying history, one must trace back to the source to find the deep causes of events.